5-(4-Bromophenyl)isoxazole-3-carboxylic Acid CAS 33282-23-4
| CAS No. | 33282-23-4 |
| Molecular Formula | C10H6BrNO3 |
| Molecular Weight | 268.06 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
5-(4-Bromophenyl)isoxazole-3-carboxylic Acid (CAS 33282-23-4), molecular formula C10H6BrNO3 and molecular weight 268.06 g/mol, is a CATO reference standard with documented purity and traceability.
5-(4-Bromophenyl)isoxazole-3-carboxylic Acid (C10H6BrNO3) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, bromine substitution. It is notably hygroscopic, halogen substitution raises its density and boiling point, its high carbon-to-hydrogen ratio confers good lipid solubility, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C10H6BrNO3 |
| Molecular Weight | 268.06 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1966 |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 1 |
Related Bromophenyl Standards
- 3-(3-bromophenyl)-1,2-oxazole-5-carboxylic acid (CAS 1152531-91-3)
- 2-(3-Bromophenyl)oxazole-4-carboxylic acid (CAS 1187933-11-4)
- 2-(4-Bromophenyl)oxazole-4-carboxylic acid (CAS 1248304-94-0)
- 5-(4-Bromophenyl)oxazole-4-carboxylic acid (CAS 1249008-71-6)
- 5-(2-Bromophenyl)oxazole-4-carboxylic acid (CAS 1249514-70-2)
- 2-(4-Bromophenyl)oxazole-5-carboxylic acid (CAS 1351385-44-8)
- 3-(2-Bromophenyl)isoxazole-5-carboxylic acid (CAS 901930-32-3)
- 3-(4-Bromophenyl)-1,2-oxazole-5-carboxylic acid (CAS 901930-35-6)
Recommended Standards
- 5-(3-Bromophenyl)isoxazole-4-carboxylic acid (CAS 887408-13-1)
- 5-(4-Bromophenyl)isoxazole-4-carboxylic acid (CAS 887408-14-2)
- 5-(3-Bromophenyl)isoxazole-3-carboxylic Acid (CAS 887979-15-9)
- 5-Bromo-4,5-dihydrooxazolo[5,4,3-ij]quinoline-2,6-dione (CAS 75655-13-9)
- 2,5-Diamino-9H-fluoren-9-one (CAS 46487-37-0)
- 1-Cyclopropylhexan-1-ol (CAS 65364-55-8)
- tert-butyl N-[1-(2-oxoethyl)cyclobutyl]carbamate (CAS 1335042-17-5)
- 2,5-Bis-(4-fluorophenyl)-1,3,4-oxadiazole (CAS 324-81-2)
- 5-Methoxypicolinamide (CAS 88166-65-8)
- 3-(4-Fluorophenyl)-1,4-diazaspiro[4.6]Undec-3-ene-2-thione (CAS 899926-69-3)
- 9-Bromo-4,5-dihydro-1H-benzo[b]azepin-2(3H)-one (CAS 1269293-40-4)
- (E)-2-((4-chlorobenzyl)thio)quinoline-3-carbaldehyde O-(3-chlorobenzoyl) oxime (CAS 551921-75-6)
- 3-(2-Methoxyphenoxy)benzenesulfonylchloride (CAS 521980-26-7)
- Des-Ala28-Tirzepatide (CAS CATO-CPTD788945)
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